[ GLSA 200501-43 ] f2c: Insecure temporary file creation

From: Thierry Carrez (koon_at_gentoo.org)
Date: 01/30/05

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To: gentoo-announce@lists.gentoo.org

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    Gentoo Linux Security Advisory GLSA 200501-43
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                                                http://security.gentoo.org/
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      Severity: Normal
         Title: f2c: Insecure temporary file creation
          Date: January 30, 2005
          Bugs: #79725
            ID: 200501-43

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    Synopsis
    ========

    f2c is vulnerable to symlink attacks, potentially allowing a local user
    to overwrite arbitrary files.

    Background
    ==========

    f2c is a Fortran to C translator. Portage uses this package in some
    ebuilds to build Fortran sources.

    Affected packages
    =================

        -------------------------------------------------------------------
         Package / Vulnerable / Unaffected
        -------------------------------------------------------------------
      1 dev-lang/f2c <= 20030320 >= 20030320-r1

    Description
    ===========

    Javier Fernandez-Sanguino Pena from the Debian Security Audit Team
    discovered that f2c creates temporary files in world-writeable
    directories with predictable names.

    Impact
    ======

    A local attacker could create symbolic links in the temporary files
    directory, pointing to a valid file somewhere on the filesystem. When
    f2c is executed, this would result in the file being overwritten with
    the rights of the user running the software, which could be the root
    user.

    Workaround
    ==========

    There is no known workaround at this time.

    Resolution
    ==========

    All f2c users should upgrade to the latest version:

        # emerge --sync
        # emerge --ask --oneshot --verbose ">=dev-lang/f2c-20030320-r1"

    References
    ==========

      [ 1 ] CAN-2005-0017
            http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-0017

    Availability
    ============

    This GLSA and any updates to it are available for viewing at
    the Gentoo Security Website:

      http://security.gentoo.org/glsa/glsa-200501-43.xml

    Concerns?
    =========

    Security is a primary focus of Gentoo Linux and ensuring the
    confidentiality and security of our users machines is of utmost
    importance to us. Any security concerns should be addressed to
    security@gentoo.org or alternatively, you may file a bug at
    http://bugs.gentoo.org.

    License
    =======

    Copyright 2005 Gentoo Foundation, Inc; referenced text
    belongs to its owner(s).

    The contents of this document are licensed under the
    Creative Commons - Attribution / Share Alike license.

    http://creativecommons.org/licenses/by-sa/2.0

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